We found one dictionary that defines the word nittiness:

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1. nittiness: Wiktionary

Definitions from Wiktionary (nittiness) ▸ noun:  The quality of being nitty. ▸ Words similar to nittiness ▸ Usage examples for nittiness ▸ Idioms related to nittiness ▸ Wikipedia articles (New!) ▸ Popular adjectives describing nittiness ▸ Words that often appear near nittiness ▸ Rhymes of nittiness ▸ Invented words related to nittiness